5 Sep
2007
5 Sep
'07
12:55 p.m.
On Sep 5, 2007, at 12:56 AM, Roy J. Tellason wrote:
Sure. I have a bunch of PALs around, mostly pulls
from a bunch of
XT-class
machines that Zenith made, and it's debatable whether there will
ever be a
use for them. GALs, on the other hand, sound like they'be be
useful for
all sorts of things. I should probably seek out some data on these
parts,
or even a databook, somewhere. Got any pointers to specific numbers?
Datasheets for these parts aren't difficult to come by. Despite
all the hype about them having been replaced by FPGAs and CPLDs, they
are still a current product line from a few different manufacturers
(Cypress and Atmel come to mind) and are available from most of the
major distributors.
The most popular ones seem to be the 16V8 and 22V10 (GAL16V8 and
GAL22V10).
It's worth noting that some CPLD families are more-or-less direct
implementations of common PAL architectures. A Xilinx XC9536 CPLD,
for example, is very similar to two of what might have been called
PAL36V18. This comes in very handy if you're experienced with PAL
design and want to move into higher-density devices.
The PALs that you have a pulls are likely useless because they're
one-time programmable. GALs and PALCE devices are electrically-
eraseable, and possibly some others, but not straight PALs.
-Dave
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007